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Based on the temporal dynamics of ecological environment quality evaluation

Author: ChangJunJie
Tutor: WangXiaoFeng；LiJingYi
School: Shaanxi Normal University
Course: Cartography and Geographic Information Systems
Keywords: Environmental quality Arid Zone Temporal dynamics model Shiyang River Basin Web Service
CLC: X826
Type: Master's thesis
Year: 2011
Downloads: 110
Quote: 0
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Abstract

Environmental problems facing human society today global issues, is one of the hot issues of environmental assessment. Ecological and environmental problems have become an obstacle to economic development in arid areas facing major problems. Arid ecological environment quality evaluation is intended to increase the ecological environment and economic contradictions into a unified, the pursuit of ecological balance of the economy, so arid region's economic development and ecological protection and coordinated development, the establishment of a reasonable quality of ecological environment evaluation system . This paper uses RS technology as the primary means of monitoring continents, spatial analysis using GIS as the main tool and mapping methods to characteristics of ecological environment as the basis to establish meteorological factors, topography, land and vegetation factor is a factor index layer, and each one is composed of several indicators composed of two indicators of ecological environment quality evaluation system; establish temporal dynamics of ecological environment analysis model, which mainly includes ten transfer analysis models use NDVI temporal and spatial variation analysis models and temporal EQI the rate of change model: Meanwhile, Web Service based on the evaluation of ecological environment quality information services publish the results in order to achieve information sharing and utilization. In this paper, the Shiyang River Basin, Gansu Province, validation of ecological environment quality evaluation system and method for dynamic analysis of spatial and temporal correctness. Through research, draw the following conclusions: (1) Through the Shiyang River Basin empirical research to verify the quality of ecological environment evaluation system and temporal dynamic analysis model is reasonable and correct. (2) the ecological environment of the Shiyang River Basin has a significant level of differentiation, vertical differentiation and the spatial and temporal variation. In the horizontal direction, the upstream watershed ecological environment quality is best, followed by middle and lower reaches worst; ecological environment quality higher degree of spatial fragmentation, in addition to the Gobi desert relatively continuous zone, the rest were scattered like distribution; regional point of view from the executive Gulang County, Yongdeng County, Sunan and Tianzhu Tibetan Autonomous County environmental quality is better, but because of its mostly out, the less populated, relatively little change in environmental quality. In the vertical direction, the distribution of the more obvious differences, showed a positive change of state, the lowest point 1180m from the area began to 3000m or so, environmental quality is rising, from 3000m upwards, declining environmental quality, the overall inverted \U \Differentiation on the temporal dynamics, mainly from the transfer of land use, NDVI temporal and spatial variation degree, EQI analyzed in terms of spatial and temporal variation rate spatial differentiation. (3) the transfer of land use change in perspective from 1990 to 2000 a major change in the central region ,2000-2004 is mainly southeastern region, while the change in 2004-2009, broken widely dispersed areas, ecological impact of environmental damage great; NDVI temporal and spatial variation from the perspective of the three periods NDVI temporal and spatial variation degree similar, but the degree of change in central and southern regions higher than the north-south vertical transverse things mean change greater degree, something is 0.04 horizontal, north-south vertical 0.03; EQI temporal rate of change from the research in the 1990-2000 regional ecological damage occurred in the period 2000-2004 to improve environmental quality, ecological damage occurred in the 2000-2004 region in the period 2004-2009 part of the ecological environment quality has improved. (4) Based on Web Service geographic information technology will spatial information database, spatial information services and business services conducted in-depth system integration, and use Web Service geographic information technology to achieve the Shiyang River Basin ecological environment quality service information dissemination, so as to achieve shared with utilization of the day.

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